just nostr: and then the npub is the standard mention format, clients then add a p tag with their hex formatted pubkey as well
Discussion
Oh nice thats good to know
oh yes and if you have notes `nevent` codes or relay `naddr` those also are formatted the same way, for a mention and tagging a relay, there's some others too, i forget, nip-19 is the bech32 encoded things
nostr:note1fd83qe85dqych0aalpq2dffpptmq2d4g56thlcnxpsrgssfr4g7qq5ch2z